<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
        <div class="avatar_box">
            <img src="../assets/logo.png" alt="">
        </div>
         <!-- 登录表单区域 -->
      <el-form  ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima"></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      //这是登录表单的数据绑定对象
      loginForm:{
        username:'admin',
        password:'123456'
      },
      //这是登录表单的验证规则的对象
      loginFormRules:{
        //验证用户名是否合法
        username:[
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10个字符', trigger: 'blur' }
        ],
        //验证密码是否合法
        password:[
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15个字符', trigger: 'blur' }
        ],
      }
    };
  },
  methods:{
    //点击重置按钮，重置登录表单
    resetLoginForm(){
      this.$refs.loginFormRef.resetFields();
    },
    login(){
      this.$refs.loginFormRef.validate(async valid=>{
        if(!valid) return;
      const {data:res} = await this.$http.post('login',this.loginForm)
      if(res.meta.status !==200)return this.$message.error('登录失败!')
        this.$message.success('登录成功!')
        //1.将登录成功之后的token,保存到客户端的sessionStorage中
        //  1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
        //  1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem("token",res.data.token);
        //2. 通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push("/home")

      });
    }
  }

  
}

</script>
<style lang='less' scoped>
    .login_container{
        background-color: #2b4b6b;
        height: 100%;
    }
    .login_box{
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%,-50%);  


        .avatar_box{
          height: 130px;
          width: 130px;
          border: 1px solid #eee;
          border-radius: 50%;
          padding: 10px;
          box-shadow: 0 0 10px #ddd;
          position: absolute;
          left: 50%;
          transform: translate(-50%,-50%);
          background-color: #fff;
          img{
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
          }
        } 
  }
 
.login_form{
  position: absolute;
  bottom: 0;
  width:100%;
  padding: 0 20px;
  box-sizing: border-box;
}
 .btns{
   display: flex;
   justify-content: flex-end;
 }

</style>